Alert archive / North Dakota / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 241, NWS Grand Forks, ND
NWS Grand Forks, ND issued this severe thunderstorm warning at Aug 23, 2002, 6:32 PM CDT for Cavalier County, Ramsey County, North Dakota. It was in force for 43 min. 3 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 23, 2002, 6:32 PM CDT (23:32 UTC)
- Expired
- Aug 23, 2002, 7:15 PM CDT
- In force
- 43 min
- Issued by
- NWS Grand Forks, ND
- Area
- Counties, with a storm outline in the text
Counties Cavalier County, ND, Ramsey County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 145 km from the middle of the area, began a volume at 23:34 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 23, 6:40 PM CDT | Hail 0.75 | Alsen, ND | |
| Aug 23, 6:50 PM CDT | Hail 0.75 | Edmore, ND | |
| Aug 23, 7:20 PM CDT | Tornado F0 | Lawton, ND | This tornado crossed into Walsh county. |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Bismarck Municip, ND (KBIS), launched 12:00Z, 11.5 hours before the alert went out and 251 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 855 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- -8 m²/s²
- 0-3 km storm-relative helicity
- 306 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Grand Forks, ND wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 23, 1:09 PM CDT, 5 hours 23 minutes earlier.
Area forecast discussion, Aug 23, 1:09 PM CDT, 5 hours 23 minutes before
FORECAST DISCUSSION FOR EASTERN NORTH DAKOTA AND NORTHWEST MINNESOTA NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND 109 PM CDT FRI AUG 23 2002 ...FORECAST CHALLENGE WILL BE PRECIPITATION CHANCES OVERNIGHT... .CURRENT OBSERVATIONS... WEAK SURFACE FRONT LOCATED WELL NORTH OF THE BORDER AND IS SLOWLY MOVING SOUTH. SHORT WAVE EVIDENT ON WATER VAPOR IMAGERY ALONG AND AHEAD OF FRONT. A FEW LIGHTNING STRIKES HAVE BEEN NOTED ALONG FRONT. DEWPOINTS ACROSS AREA REMAIN IN THE MID 60S WITH ALL MODELS UNDERDOING THE LOW LEVEL MOISTURE. .SHORT TERM... MAIN CHALLENGE IS THUNDER OVERNIGHT. SOME LOW LEVEL MOISTURE PRESENT BUT LIMITED ABOVE THIS LAYER. SOME WEAK SURFACE/850MB CONVERGENCE AND INSTABILITY TONIGHT. WILL PUT ISOLATED MENTION ACROSS MUCH OF THE FORECAST AREA(FA) WITH SLIGHTLY HIGHER POPS ACROSS NORTHWEST MINNESOTA. .MID TERM... WEAK SURFACE HIGH WILL PUSH FRONT SOUTH OF FA ON SATURDAY AND WILL KEEP PRECIPITATION OUT OF THE REGION UNTIL SUNDAY NIGHT. BY SUNDAY NIGHT...UPPER LEVEL LOW EJECTS OUT OF THE PACIFIC NORTHWEST AND INTO THE NORTHERN HIGH PLAINS. SEVERAL WAVES EXPECTED TO ROTATE AROUND SYSTEM AND WILL BRING CHANCE OF THUNDERSTORMS TO THE RED RIVER VALLEY AND AREAS WEST INTO MONDAY...HOWEVER MOISTURE WILL BE LIMITED WITH A BLOCKING PATTERN TO THE SOUTH. .EXTENDED FORECAST... ECMWF IS ODD MODEL OUT IS SHOWING AMPLIFYING UPR LOW AND COLD AIR DROPPING SOUTHEAST TOWARD NRN MN BY 12Z THU. NCEP ENSEMBLES/NOGAPS/MRF/CANADIAN ALL GO AGAINST THIS SHOWING MAIN POLAR JET AND COLD AIR WELL NORTH ACROSS NRN CANADA WITH MUCH WEAKER 50H SYSTEMS DROPPING THRU NRN PLAINS TUE-WED TIME FRAME. CANADIAN AND NOGAPS ARE EVEN WEAKER THAN THE MRF AND WOULD IMPLY ONLY SMALL CHANCES OF PCPN TUE-WED VERSUS HEAVIER QPF OF MRF. BELIEVE THIS MAY BE RIGHT. WILL HOWEVER STILL KEEP CHC IN PER CURRENT EXTENDED FOR TUE-WED...THEN DRY THU-FRI AND STILL MILD WITH NEAR NORMAL TEMPS. .FGF...NONE DONAVON/RIDDLE
In the hours before
Special weather statement, Aug 23, 3:50 PM CDT, 2 hours 42 minutes before
MNZ001>009-013>017-022>024-027>031-040-NDZ006>008-014>016-024- 026>030-038-039-049-052>054-232345- SPECIAL WEATHER STATEMENT HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS 350 PM CDT FRI AUG 23 2002 ...ISOLATED SEVERE THUNDERSTORMS POSSIBLE TONIGHT ACROSS NORTHEAST NORTH DAKOTA AND ADJACENT NORTHWEST MINNESOTA... SYNOPSIS... SCATTERED THUNDERSTORMS ARE EXPECTED TONIGHT ACROSS EASTERN NORTH DAKOTA...NORTHWEST AND WEST CENTRAL MINNESOTA. A WEAK COLD FRONT WILL MOVE FROM NORTH TO SOUTH ACROSS THE REGION OVERNIGHT. MOISTURE ASSOCIATED ALONG THE FRONT COUPLED WITH LIFT FROM AN UPPER LEVEL DISTURBANCE WILL ENHANCE THUNDERSTORM ACTIVITY THIS EVENING ALONG THE INTERNATIONAL BORDER...AS THE THUNDERSTORMS MOVE INTO THE AREA AFTER 5 PM. AREA OF CONCERN... NORTHEAST NORTH DAKOTA AND ADJACENT PORTIONS OF NORTHWEST MINNESOTA. TIME... 5 PM UNTIL 10 PM. TYPE OF HAZARD... LARGE HAIL WILL BE THE MAIN THREAT. KELLENBENZ NNNN
Local storm report, Aug 23, 6:19 PM CDT, 13 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
619 PM CDT FRI AUG 23 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0525 PM 3 N SARLES ND .75 INCH HAIL
08/23/02 CAVALIER REPORTED BY PUBLIC.
0530 PM 7 SW WALHALLA ND .75 INCH HAIL
08/23/02 PEMBINA REPORTED BY CO-OP OBSERVER.
0545 PM 13 W CAVALIER ND .88 INCH HAIL
08/23/02 PEMBINA REPORTED BY CO-OP OBSERVER.
0555 PM 1 N PERTH ND 1.00 INCH HAIL
08/23/02 TOWNER REPORTED BY CO-OP OBSERVER.
DPORTERLocal storm report, Aug 23, 6:30 PM CDT, 2 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
630 PM CDT FRI AUG 23 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0628 PM 2 E MOUNTAIN ND 1.00 INCH HAIL
08/23/02 PEMBINA
JHLocal storm report, Aug 23, 6:32 PM CDT, 0 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND FORKS, ND
632 PM CDT FRI AUG 23 2002
TIME(CDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0620 PM 5 NW BISBEE ND .75 INCH HAIL
08/23/02 TOWNER REPORTED BY CO-OP OBSERVER.
0630 PM 3 S MOUNTAIN ND TORNADO
08/23/02 PEMBINA REPORTED BY CO-OP OBSERVER.
DPORTERThe office that day
Everything else NWS Grand Forks, ND issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 23, 4:52 PM CDT | Severe Thunderstorm Warning | FGF | Towner | 38 min |
| Aug 23, 5:07 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier | 38 min |
| Aug 23, 5:30 PM CDT | Severe Thunderstorm Warning | FGF | Towner | 45 min |
| Aug 23, 5:42 PM CDT | Severe Thunderstorm Warning | FGF | Cavalier | 48 min |
| Aug 23, 5:44 PM CDT | Severe Thunderstorm Warning | FGF | Pembina | 46 min |
| Aug 23, 6:13 PM CDT | Severe Thunderstorm Warning | FGF | Towner | 47 min |
| Aug 23, 6:20 PM CDT | Tornado Warning | FGF | Pembina | 40 min |
| Aug 23, 6:43 PM CDT | Severe Thunderstorm Warning | FGF | Walsh | 47 min |
Nearby
Severe Thunderstorm Warnings in North Dakota, 2002Every severe thunderstorm warning in 2002
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.